GPU is not detected by pc

[SamPorky]

After a new build and taking out my gpu and hard drives from my old working pc and put it into my new parts (motherboard,ram,cpu.) I find that there is power to the card ( the fans spin) however no display, is this because windows isn’t downloading the correct (or any)  drivers? As I go onto my onboard graphics I get a display and look into device manager to only see intel graphics and no Nvidia cars drivers, if I try to download these drivers nvidia will not let me as it can’t detect any nvidia hardware. 
Please note:
- i have tested my gpu and cpu + ram on another motherboard to find the same problem.
- I have tested my gpu in another working pc to find it working.
- i have tried another 600w psu.
- I have made sure the six pin connector is connected into the gpu. 
- I have reseated the card several times.
- if I try the gpu display I do not get any display at all ( I can’t get to see the screen to go to the BIOS)
-I have been on the BIOS using onboard graphics to find the primary display is on ‘auto’ and attempted to change this to ‘PCI-E’ however when I save and exit I find the changes just revert back to auto.
- the bios detects the RAM.
- I have tried a different monitor and different port (hdmi and DisplayPort).
- my bios version is 0.0810 ( is this the latest? For my Asus b250m-a motherboard.
Specs:
Cpu: I7 7700k 4.20ghz
gpu: asus Gtx 1060 3gb
Motherboard: ASUS prime b250m-a
Ram: Corsair vengeance 2x4gb 3000mhz ( running at 2133mhz)
Psu: Corsair 450w
2x hard drive.

Thanks for reading and hope you can help, I have really run out of ideas and am really confused as to why it’s not working. Thanks in advance, Sam.

[Cereal5]

Use display driver uninstaller to uninstall all your current drivers, then reinstall the lastest one from NVIDIA’s website. 

[Lord Letto]

1) Bad Motherboard

2) Bad PSU

3) Both

it's one of those based on my experence.

[Nae Tellin]

You might have killed it with static electricity ?